Keithley 6487 Reference Manual

Example reading limits calculation ................................... 15-5
Calibrator voltage calculations ................................................. 15-5
Performing the verification test procedures .............................. 15-6
Test considerations ............................................................ 15-6
Restoring factory defaults ................................................. 15-6
Offset voltage calibration ......................................................... 15-7
Current measurement accuracy ................................................ 15-7
20µA-20mA range accuracy .............................................. 15-7
2nA-2µA range accuracy ................................................... 15-8
Voltage source output accuracy .............................................. 15-10
16 Calibration
Introduction .............................................................................. 16-2
Environmental conditions ......................................................... 16-2
Temperature and relative humidity .................................... 16-2
Warm-up period ................................................................. 16-2
Line power ......................................................................... 16-2
Calibration considerations ........................................................ 16-3
Calibration cycle ....................................................................... 16-3
Recommended calibration equipment ...................................... 16-3
Calibration errors ...................................................................... 16-4
Calibration menu ...................................................................... 16-5
Aborting calibration .................................................................. 16-6
Current calculations .................................................................. 16-6
Calibration procedure ............................................................... 16-7
Preparing for calibration .................................................... 16-7
Offset voltage calibration .................................................. 16-7
Current calibration ............................................................. 16-8
Voltage source calibration ............................................... 16-12
Entering calibration dates and saving calibration ............ 16-13
Locking out calibration ................................................... 16-14
Calibration support ................................................................. 16-14
Changing the calibration code ......................................... 16-14
Resetting the calibration code ......................................... 16-15
Displaying calibration dates ............................................ 16-15
Displaying the calibration count ..................................... 16-15
17 Routine Maintenance
Introduction .............................................................................. 17-2
Setting line voltage and replacing line fuse .............................. 17-2
Front panel tests ........................................................................ 17-3
DISP test ............................................................................ 17-4
KEY test ............................................................................ 17-4

Keithley 6487 Specifications

General

Type	Picoammeter/Voltage Source
Current Measurement Range	20 fA to 20 mA
Interfaces	GPIB, RS-232
Voltage Burden	< 200 µV
Input Impedance	>10^14 Ω
Power	100 V / 120 V / 220 V / 240 V
Basic Current Measurement Accuracy	0.4%